class Person:
    def __init__(self,name,age):
        self.name = name
        self.__age = age

    def say_age(self):
        print("{}的年龄时：{}".format(self.name,self.__age))


class Student(Person):
    def __init__(self,name,age,score):
        #Person.__init__(self,name,age)
        super().__init__(name,age)
        self.score = score

print(Student.mro())

s = Student('tom',18,75)
s.say_age()
print(s.name)
print(dir(s))
print(s.__dict__)
# print(s._Person__age)